function slide(src,link,text,target,attr) {
this.src = src;
this.link = link;


this.text = text;


this.target = target;

  // Custom duration for the slide, in milliseconds.
  // This is an optional parameter.
   this.timeout = 8000

// Attributes for the target window:
// width=n,height=n,resizable=yes or no,scrollbars=yes or no,
// toolbar=yes or no,location=yes or no,directories=yes or no,
// status=yes or no,menubar=yes or no,copyhistory=yes or no
// Example: "width=200,height=300"
this.attr = attr;

if (document.images) {
this.image = new Image();
}

this.loaded = false;


this.load = function() {

if (!document.images) { return; }

if (!this.loaded) {
this.image.src = this.src;
this.loaded = true;
}
}


this.hotlink = function() {

var mywindow;


if (!this.link) return;


if (this.target) {
if (this.attr) {
mywindow = window.open(this.link, this.target, this.attr);  
} else {
mywindow = window.open(this.link, this.target);
}

if (mywindow && mywindow.focus) mywindow.focus();

} else {
location.href = this.link;
}
}
}


function slideshow( slideshowname ) {

this.name = slideshowname;

this.repeat = true;

this.prefetch = -1;

this.image;

this.textid;

this.textarea;

this.timeout = 3000;


this.slides = new Array();
this.current = 0;
this.timeoutid = 0;

this.add_slide = function(slide) {

var i = this.slides.length;

if (this.prefetch == -1) {
slide.load();
}

this.slides[i] = slide;
}

this.play = function(timeout) {
this.pause();


if (timeout) {
this.timeout = timeout;
}

if (typeof this.slides[ this.current ].timeout != 'undefined') {
timeout = this.slides[ this.current ].timeout;
} else {
timeout = this.timeout;
}

this.timeoutid = setTimeout( this.name + ".loop()", timeout);
}

this.pause = function() {


if (this.timeoutid != 0) {

clearTimeout(this.timeoutid);
this.timeoutid = 0;

}
}

this.update = function() {
if (! this.valid_image()) { return; }
if (typeof this.pre_update_hook == 'function') {
this.pre_update_hook();
}

var slide = this.slides[ this.current ];

var dofilter = false;
if (this.image &&
typeof this.image.filters != 'undefined' &&
typeof this.image.filters[0] != 'undefined') {

dofilter = true;

}

slide.load();

if (dofilter) {

if (slide.filter &&
this.image.style &&
this.image.style.filter) {

this.image.style.filter = slide.filter;

}
this.image.filters[0].Apply();
}

this.image.src = slide.image.src;

if (dofilter) {
this.image.filters[0].Play();
}

this.display_text();

if (typeof this.post_update_hook == 'function') {
this.post_update_hook();
}

if (this.prefetch > 0) {

var next, prev, count;

next = this.current;
prev = this.current;
count = 0;
do {

if (++next >= this.slides.length) next = 0;
if (--prev < 0) prev = this.slides.length - 1;

this.slides[next].load();
this.slides[prev].load();

} while (++count < this.prefetch);
}
}

this.goto_slide = function(n) {

if (n == -1) {
n = this.slides.length - 1;
}

if (n < this.slides.length && n >= 0) {
this.current = n;
}

this.update();
}


this.goto_random_slide = function(include_current) {
var i;

if (this.slides.length > 1) {
do {
i = Math.floor(Math.random()*this.slides.length);
} while (i == this.current);
this.goto_slide(i);
}
}


this.next = function() {
if (this.current < this.slides.length - 1) {
this.current++;
} else if (this.repeat) {
this.current = 0;
}

this.update();
}


this.previous = function() {
if (this.current > 0) {
this.current--;
} else if (this.repeat) {
this.current = this.slides.length - 1;
}

this.update();
}



this.shuffle = function() {

var i, i2, slides_copy, slides_randomized;
slides_copy = new Array();
for (i = 0; i < this.slides.length; i++) {
slides_copy[i] = this.slides[i];
}

slides_randomized = new Array();

do {

i = Math.floor(Math.random()*slides_copy.length);

slides_randomized[ slides_randomized.length ] =
slides_copy[i];
for (i2 = i + 1; i2 < slides_copy.length; i2++) {
slides_copy[i2 - 1] = slides_copy[i2];
}
slides_copy.length--;

} while (slides_copy.length);

this.slides = slides_randomized;
}


this.get_text = function() {

return(this.slides[ this.current ].text);
}


this.get_all_text = function(before_slide, after_slide) {

all_text = "";

for (i=0; i < this.slides.length; i++) {

slide = this.slides[i];

if (slide.text) {
all_text += before_slide + slide.text + after_slide;
}

}

return(all_text);
}

this.display_text = function(text) {
if (!text) {
text = this.slides[ this.current ].text;
}

if (this.textarea && typeof this.textarea.value != 'undefined') {
this.textarea.value = text;
}

if (this.textid) {

r = this.getElementById(this.textid);
if (!r) { return false; }
if (typeof r.innerHTML == 'undefined') { return false; }

r.innerHTML = text;
}
}


this.hotlink = function() {

this.slides[ this.current ].hotlink();
}

this.save_position = function(cookiename) {

if (!cookiename) {
cookiename = this.name + '_slideshow';
}

document.cookie = cookiename + '=' + this.current;
}


this.restore_position = function(cookiename) {

if (!cookiename) {
cookiename = this.name + '_slideshow';
}

var search = cookiename + "=";

if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search);
// if cookie exists
if (offset != -1) { 
offset += search.length;
// set index of beginning of value
end = document.cookie.indexOf(";", offset);
// set index of end of cookie value
if (end == -1) end = document.cookie.length;
this.current = parseInt(unescape(document.cookie.substring(offset, end)));
}
}
}


this.noscript = function() {

$html = "\n";

for (i=0; i < this.slides.length; i++) {

slide = this.slides[i];

$html += '<P>';

if (slide.link) {
$html += '<a href="' + slide.link + '">';
}

$html += '<img src="' + slide.src + '" ALT="slideshow image">';

if (slide.link) {
$html += "<\/a>";
}

if (slide.text) {
$html += "<BR>\n" + slide.text;
}

$html += "<\/P>" + "\n\n";
}

$html = $html.replace(/\&/g, "&amp;" );
$html = $html.replace(/</g, "&lt;" );
$html = $html.replace(/>/g, "&gt;" );

return('<pre>' + $html + '</pre>');
}

this.loop = function() {
if (this.current < this.slides.length - 1) {
next_slide = this.slides[this.current + 1];
if (next_slide.image.complete == null || next_slide.image.complete) {
this.next();
}
} else { 
this.next();
}

this.play( );
}


this.valid_image = function() {

if (!this.image)
{
return false;
}
else {
return true;
}
}

this.getElementById = function(element_id) {


if (document.getElementById) {
return document.getElementById(element_id);
}
else if (document.all) {
return document.all[element_id];
}
else if (document.layers) {
return document.layers[element_id];
} else {
return undefined;
}
}


this.set_image = function(imageobject) {

if (!document.images)
return;
this.image = imageobject;
}

this.set_textarea = function(textareaobject) {

this.textarea = textareaobject;
this.display_text();
}


this.set_textid = function(textidstr) {

this.textid = textidstr;
this.display_text();
}
}
